#include"selct.h"
int select(int nfds, fd_set *readfds, fd_set *writefds,
                 fd_set *exceptfds, struct timeval *timeout);

      void FD_CLR(int fd, fd_set *set);
      int FD_ISSET(int fd, fd_set *set);
      void FD_SET(int fd, fd_set *set);
      void FD_ZERO(fd_set *set);
void fd_clr(int )
